<template>
  <div>
    <el-card class="category-container">
      <template #header>
        <div class="header">
          <el-button type="primary" size="small" icon="el-icon-plus" @click="handleAdd">增加</el-button>
          <el-popconfirm title="确定删除吗？" @confirm="handleDelete">
            <template #reference>
              <el-button type="danger" size="small" icon="el-icon-delete">批量删除</el-button>
            </template>
          </el-popconfirm>
        </div>
      </template>
      <el-table
        v-loading="loading"
        ref="multipleTable"
        :data="tableData"
        tooltip-effect="dark"
        style="width: 100%"
        @selection-change="handleSelectionChange"
      >
        <el-table-column type="selection" width="55"></el-table-column>
        <el-table-column prop="categoryName" label="分类名称"></el-table-column>
        <el-table-column prop="categoryRank" label="排序值" width="120"></el-table-column>
        <el-table-column prop="createTime" label="添加时间" width="200"></el-table-column>
        <el-table-column label="操作" width="220">
          <template #default="scope">
            <a
              style="cursor: pointer; margin-right: 10px"
              @click="handleEdit(scope.row.categoryId)"
            >修改</a>
            <a style="cursor: pointer; margin-right: 10px" @click="handleNext(scope.row)">下级分类</a>
            <el-popconfirm title="确定删除吗？" @confirm="handleDeleteOne(scope.row.categoryId)">
              <template #reference>
                <a style="cursor: pointer">删除</a>
              </template>
            </el-popconfirm>
          </template>
        </el-table-column>
      </el-table>
      <!--总数超过一页，再展示分页器-->
      <el-pagination
        background
        layout="prev, pager, next"
        :total="total"
        :page-size="pageSize"
        :current-page="currentPage"
        @current-change="changePage"
      />
    </el-card>
    <DialogAddCategory
      ref="addGood"
      :reload="getCategory"
      :type="type"
      :level="level"
      :parent_id="parent_id"
    />
  </div>
</template>

<script>
import { onMounted, onUnmounted, reactive, ref, toRefs } from "vue";
import { useRoute, useRouter } from "vue-router";
import { ElMessage } from "element-plus";
import DialogAddCategory from "@/components/DialogAddCategory.vue";
import axios from "@/utils/axios";
export default {
  name: "Category",
  components: {
    DialogAddCategory
  },
  setup() {
    const multipleTable = ref(null);
    const addGood = ref(null);
    const router = useRouter();
    const route = useRoute();
    const state = reactive({
      loading: false,
      tableData: [], // 数据列表
      multipleSelection: [], // 选中项
      total: 0, // 总条数
      currentPage: 1, // 当前页
      pageSize: 10, // 分页大小
      type: "add", // 操作类型
      level: 1,
      parent_id: 0
    });
    onMounted(() => {
      getCategory();
    });
    onUnmounted(() => {
      unwatch();
    });
    const unwatch = router.afterEach(to => {
      if (["category", "level2", "level3"].includes(to.name)) {
        getCategory();
      }
    });
    // 获取分类列表
    const getCategory = () => {
      const { level = 1, parent_id = 0 } = route.query;
      state.loading = true;
      axios
        .get("/categories", {
          params: {
            pageNumber: state.currentPage,
            pageSize: state.pageSize,
            categoryLevel: level,
            parentId: parent_id
          }
        })
        .then(res => {
          state.tableData = res.list;
          state.total = res.totalCount;
          state.currentPage = res.currPage;
          state.loading = false;
          state.level = level;
          state.parentId = parent_id;
        });
    };
    // 添加分类
    const handleAdd = () => {
      state.type = "add";
      addGood.value.open();
    };
    // 修改分类
    const handleEdit = id => {
      state.type = "edit";
      addGood.value.open(id);
    };
    // 选择项
    const handleSelectionChange = val => {
      state.multipleSelection = val;
    };
    // 批量删除
    const handleDelete = () => {
      if (!state.multipleSelection.length) {
        ElMessage.error("请选择项");
        return;
      }
      axios
        .delete("/categories", {
          data: {
            ids: state.multipleSelection.map(i => i.categoryId)
          }
        })
        .then(() => {
          ElMessage.success("删除成功");
          getCategory();
        });
    };
    // 单个删除
    const handleDeleteOne = id => {
      axios
        .delete("/categories", {
          data: {
            ids: [id]
          }
        })
        .then(() => {
          ElMessage.success("删除成功");
          getCategory();
        });
    };
    const changePage = val => {
      state.currentPage = val;
      getCategory();
    };
    const handleNext = item => {
      const levelNumber = item.categoryLevel + 1;
      if (levelNumber == 4) {
        ElMessage.error("没有下一级");
        return;
      }
      router.push({
        name: `level${levelNumber}`,
        query: {
          level: levelNumber,
          parent_id: item.categoryId
        }
      });
    };
    return {
      ...toRefs(state),
      multipleTable,
      handleSelectionChange,
      addGood,
      handleAdd,
      handleEdit,
      handleDelete,
      handleDeleteOne,
      getCategory,
      changePage,
      handleNext
    };
  }
};
</script>

<style scoped>
.category-container {
  min-height: 100%;
}
.el-card.is-always-shadow {
  min-height: 100% !important;
}
</style>